In the video, [img=113x23]1803a31aeb636b1.png[/img] are independent. ( )
举一反三
- In the video, [img=20x22]17de68f6d067079.png[/img] and [img=21x25]17de6f5f1acb950.png[/img] are independent. ( )
- In the video, [img=20x22]1803a31af215721.png[/img] and [img=21x25]1803a31afb0b8f1.png[/img] are independent. ( )
- 已知D(X) = 2，D(Y) = 1，X和Y的相关系数[img=109x29]180357352f85f5d.png[/img].则D(2X+Y+1) = . A: 19/3 B: 23/3 C: 28/3 D: 31/3
- 设总体X服从正态分布[img=70x27]1803c0805e8d420.png[/img] [img=113x23]1803c08066b2b49.png[/img]是来自总体X的样本，则 [img=129x52]1803c080712e9da.png[/img]
- 设总体X 服从正态分布[img=65x27]18033962a33b790.png[/img],[img=113x23]18033962b1331b4.png[/img]是来自总体X的样本，则 [img=124x52]18033962bcf17f3.png[/img].